212320320021218 has 4 divisors (see below), whose sum is σ = 318480480031830. Its totient is φ = 106160160010608.

The previous prime is 212320320021217. The next prime is 212320320021233. The reversal of 212320320021218 is 812120023023212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 195057898813969 + 17262421207249 = 13966313^2 + 4154807^2 .

It is not an unprimeable number, because it can be changed into a prime (212320320021217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53080080005303 + ... + 53080080005306.

Almost surely, 2^{212320320021218} is an apocalyptic number.

212320320021218 is a deficient number, since it is larger than the sum of its proper divisors (106160160010612).

212320320021218 is a wasteful number, since it uses less digits than its factorization.

212320320021218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106160160010611.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 212320320021218 in words is "two hundred twelve trillion, three hundred twenty billion, three hundred twenty million, twenty-one thousand, two hundred eighteen".